histology of the nervous system(exam4)

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what are the 2 cell types of the nervous system?

1.stroma of the nervous system->neuroglial cells (glia=glue)

2.Parenchyma of the nervous system->neurons (the functional cells)

what does the neuroglial cells provide & what is it a common source of?

a. they provide physical and/or metabolic support for the functional cells

b.they are a common source of nervous system tumors->gliomas

what parenchyma of the nervous system->neurons?

the functional cells

what are the 4 types of neuroglial cells in the CNS?

1.Astrocytes

2.Oligodendrocytes

3.Ependyma Cells

4. Microglial cells

what is the 1 type of neuroglial cell in the periheral nervous system(PNS)?

schwann cells

which neuroglial cell in the CNS is star shaped cells with numerous "processes"

astrocytes

which neuroglial cells in the CNS have some processes that wrap around (twine) adjacent neurons providing physical support?

astocytes

which neuroglial cells in the CNS have some processes that wrap around adjacent capillaries->which provides metabolic support?

astrocytes

why do astrocytes have some processes wrap around adjacent capillaries?

it creates a pathway for the exchange of nutrients and wastes through the astrocyte.

when astrocytes processes wrap around adjacent capillaries creating a pathway for the exchange of nutrients and waste through the astrocyte the neuron is not in direct contact with the blood vessel so in par is responsible for what?

"blood-brain barrier"

(astrocyte) when a neuron is not in direct contact with the blood vessel and is in part is responsible for "blood-brain barrier" what does it isolate?

it isolates brain neurons from bloodstream

(astrocyte)what happens when the brain neurons are isolated from blood stream?

a.minimizes chances for infection

b.difficult to treat a CNS infection because it is isolated from immune system

(astrocytes) what would happen if blood-brain barrier should fail

auto immune disease

which neuroglial cells in the CNS have a star shaped cells w/fewer processes than astrocytes?

oligodendrocytes

which neuroglial cells in the CNS form semi-rigid connective tissue rows->providing physical support?

oligodendrocytes

which neuroglial cells in the CNS has a process that can wrap around a neuron multiple times forming a "myolin sheath"?

oligodendrocytes

when an oligodendrocytes process wraps around a neuron multiple times forming a myolin sheath what does a lipid covering it do?

a lipid covering that insulates the neuron electrically

which neuroglial cells in the CNS has small cells-> similar to epithelial cells->vary in shape from squamous to columnar?

ependyma cells

which neuroglial cells in the CNS form continuous sheets that line fluid filled spaces inside the CNS->ventricles and canals(filled with cerebrospinal fluid)(CSP)?

ependyma cells

when ependyma cells form continuous sheets that line fluid filled spaces inside the CNS->ventricles and canals(filled with cerebrospinal fluid)(CSP) what does it provide to the adjacent neurons?

it provides physical support for the adjacent neurons

what does it mean that many ependyma cells are ciliated

they play a role in circulation of verebrospinal fluid

which neuroglial cells in the CNS has small cells with few processes-> but the processes are highly branched?

microglial cells

which neuroglial cells in the CNS are normally stationary->but migrate to the site of tissue injury in response to chemical signals?

microglial cells

which neuroglial cells in the CNS have phagocytic cells that engulf microbe and cellular debris just white blood cells(may be derived from monocytes)?

microglial cells

(microglial cells) what is a critical function since the CNS is isolated from the immune system?

phagocytic cells->engulf microbes and cellular debris just white blood cells( may be derived from monocytes)

which neuroglial cells in the CNS often wrap around neurons producing 2 layers?

schwann cells

what are the two layers produced by the schwann cells after they wrap around neurons?

inner & outter layer

what is the inner layer of a schwann cell that is produced after they wrap around neurons?